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Updated: July 13, 2026
In 1879 a new stage of more precise knowledge of the venereal diseases began with Neisser's discovery of the gonococcus which is the specific cause of gonorrhoea. This was followed a few years later by the discovery by Ducrey and Unna of the bacillus of soft chancre, the least important of the venereal diseases because exclusively local in its effects.
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